/Engine/Source/Editor/UnrealEd/Classes/Commandlets/DiffAssetsCommandlet.h
Runs an external diff utility
true if success
static bool ExportFilesToTextAndDiff ( const [FString](API\Runtime\Core\Containers\FString) & Filename1, const [FString](API\Runtime\Core\Containers\FString) & Filename2, const [FString](API\Runtime\Core\Containers\FString) & DiffCommand )